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Microstock Photography Forum - General => Software => Photoshop Discussion => Topic started by: arunchristensen on June 19, 2013, 15:38

Title: Interpolation to get higher image size
Post by: arunchristensen on June 19, 2013, 15:38

Hi guys
I have a 1.2 MB work file with with a couple of layers, one of them with a layer mask. I've saved the file as a .jpg, but end up with a 164KB .jpg - way too small for submission.

I've read that resampling an image allows one to create a higher image size, is that true?

Could any of you direct me to proper ways how to increase the file size of the .jpg?

Thanks!

Best wishes
Arun

Title: Re: Interpolation to get higher image size
Post by: Sean Locke Photography on June 19, 2013, 15:39

It's not the file size, but the pixel dimensions of an image that matter.  Start with a higher resolution image.

Title: Re: Interpolation to get higher image size
Post by: stockastic on June 19, 2013, 15:47

If you're talking about submitting it as microstock, it's probably too small to even think about.  Yes, you can resample an image to make it larger BUT only to a certain limited extent, depending on what you intend to do with it.  I will admit that in a very few cases I have resized an image to meet an agency's arbitrary minimum size requirements, had it approved and even sold BUT I did so carefully, with images that had sufficient quality to begin with, and were already close to the needed size.  And even so, I can't recommend it, and no doubt others will jump in here and warn against it.

Title: Re: Interpolation to get higher image size
Post by: arunchristensen on June 19, 2013, 15:55

Thanks guys. It's a graphic work, so can the graphic just be enlarged in the .PSD without any problem?

Title: Re: Interpolation to get higher image size
Post by: icefront on June 19, 2013, 17:08

Don't confuse the file size with the image size.

The file size in bytes does not matter (in this context does not carry any information about the image resolution).
The total number of pixels in the image does matter. Count the flattened image's pixels by multiplying width by height.

Saving a jpg image of 1 megapixels (10000000 pixels = an image of 1000x1000 pixels) can result in 5 kilobytes or in 100 kilobytes, depending on the image content, since the image data is compressed and the compressed size depends on the image content. The more details the bigger will be the resulting file size.

Upsampling (enlarging) the image by interpolation does not introduce any new details.

Hope that helps...

Title: Re: Interpolation to get higher image size
Post by: JPSDK on June 19, 2013, 17:41

that is correct
Look at the pixel size.
Then it does not matter if its full of white on white or whatever.

Title: Re: Interpolation to get higher image size
Post by: cuppacoffee on June 19, 2013, 18:06

http://web.forret.com/tools/megapixel.asp (http://web.forret.com/tools/megapixel.asp) Megapixel Calculator

Title: Re: Interpolation to get higher image size
Post by: arunchristensen on June 20, 2013, 08:11

Thanks Icefront  :)

Best wishes

Title: Re: Interpolation to get higher image size
Post by: zeamonkey on June 21, 2013, 00:20

I have previously up sampled several 800x1200 slide scan to a 6mb file using Genuine Fractals and had them accepted at most agencies. Give it a try.